A nuclear icebreaker, foundering in Arctic waters. Seabirds washed up in the fishing resort of Ambermouth, their wings encrusted with crystals. A shining artefact of uncertain provenance, up for sale on an auction site. All of these things are linked, as the Doctor, Nyssa, Tegan, and Turlough are about to discover. Linked to the rebirth of a genocidal tyrant, presumed dead many years ago. For the sake of the planets Earth and Kastria alike, Eldrad must die!